1. Laboratory of Experimental Neurosurgery, Multidisciplinary Research Institute (I.R.I.B.H.M.), Université Libre de Bruxelles, Hôpital Erasme, B-1070 Brussels, Belgium.
2. Glykos Finland Ltd., FIN-00790 Helsinki, Finland.
3. Department of Neurosurgery, Central University Hospital of Vaud, CH-1011, Lausanne, Switzerland.